I am attempting to square up my F-3000 board and glass cutter. Is the method of placing a full sheet of matboard, making two small cuts (top and bottom), and then reversing the board and making a cut at the top the best way to accomplish squaring --- or, are there any tricks out there to do it? My machine is not cutting perfect measurements and is off by just a very small amount. Any tricks, or tips appreciated. Maybe the manual has the best method, but I wanted input from anyone else that checks their machine to be square. Thanks.